102 lines
4.4 KiB
HTML
102 lines
4.4 KiB
HTML
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<title>GNU Compiler Collection (GCC) Internals: Language-dependent trees</title>
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<a name="Language_002ddependent-trees"></a>
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Next: <a href="C-and-C_002b_002b-Trees.html#C-and-C_002b_002b-Trees" accesskey="n" rel="next">C and C++ Trees</a>, Previous: <a href="Functions.html#Functions" accesskey="p" rel="prev">Functions</a>, Up: <a href="GENERIC.html#GENERIC" accesskey="u" rel="up">GENERIC</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Language_002ddependent-trees-1"></a>
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<h3 class="section">10.9 Language-dependent trees</h3>
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<a name="index-language_002ddependent-trees"></a>
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<p>Front ends may wish to keep some state associated with various GENERIC
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trees while parsing. To support this, trees provide a set of flags
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that may be used by the front end. They are accessed using
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<code>TREE_LANG_FLAG_n</code> where ‘<samp>n</samp>’ is currently 0 through 6.
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</p>
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<p>If necessary, a front end can use some language-dependent tree
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codes in its GENERIC representation, so long as it provides a
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hook for converting them to GIMPLE and doesn’t expect them to
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work with any (hypothetical) optimizers that run before the
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conversion to GIMPLE. The intermediate representation used while
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parsing C and C++ looks very little like GENERIC, but the C and
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C++ gimplifier hooks are perfectly happy to take it as input and
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spit out GIMPLE.
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